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41 lines
1.3 KiB
41 lines
1.3 KiB
4 years ago
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import esp
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class FlashBdev:
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SEC_SIZE = 4096
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RESERVED_SECS = 1
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START_SEC = esp.flash_user_start() // SEC_SIZE + RESERVED_SECS
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NUM_BLK = 0x6b - RESERVED_SECS
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def __init__(self, blocks=NUM_BLK):
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self.blocks = blocks
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def readblocks(self, n, buf, off=0):
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#print("readblocks(%s, %x(%d), %d)" % (n, id(buf), len(buf), off))
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esp.flash_read((n + self.START_SEC) * self.SEC_SIZE + off, buf)
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def writeblocks(self, n, buf, off=None):
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#print("writeblocks(%s, %x(%d), %d)" % (n, id(buf), len(buf), off))
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#assert len(buf) <= self.SEC_SIZE, len(buf)
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if off is None:
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esp.flash_erase(n + self.START_SEC)
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off = 0
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esp.flash_write((n + self.START_SEC) * self.SEC_SIZE + off, buf)
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def ioctl(self, op, arg):
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#print("ioctl(%d, %r)" % (op, arg))
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if op == 4: # MP_BLOCKDEV_IOCTL_BLOCK_COUNT
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return self.blocks
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if op == 5: # MP_BLOCKDEV_IOCTL_BLOCK_SIZE
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return self.SEC_SIZE
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if op == 6: # MP_BLOCKDEV_IOCTL_BLOCK_ERASE
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esp.flash_erase(arg + self.START_SEC)
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return 0
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size = esp.flash_size()
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if size < 1024*1024:
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bdev = None
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else:
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# 20K at the flash end is reserved for SDK params storage
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bdev = FlashBdev((size - 20480) // FlashBdev.SEC_SIZE - FlashBdev.START_SEC)
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